I must say this sounds to me like a case of good observation followed by jumping to conclusions, something a scientist has to scupulously avoid. Eating is the last thing a slug would be concerned with after being plunged into a bath of hydrochloric acid and digestive enzymes. Epithelial cells cannot be indentified as human simply by observing them under a microscope. Any epithelial cells found in the gut of the slug could have come from something it ate before being swallowed - or more likely were its own epithelial cells, sloughed off in response to ingesting human digestive juices. Paul M.